Cragonos Sanctuary

Cragonos Sanctuary is a small area located on the highest point of Cragonos Peak. It is a sanctuary where the Legendary Beasts reside. There are no Wild Pokémon to encounter in here.

Encountering the Legendary Beasts
A character in front of the Entei statue on Cragonos Peak mentions that, if something disastrous to Roria is about to happen, Entei along with the other 2 Legendary Beasts would rush down the mountains. As the player walks into the deeper section of this area, the three Legendary Beasts — Raikou, Entei, and Suicune can be seen. Once the player approaches them, a cutscene showing the trio leaving the sanctuary will occur. Afterwards, a message will appear, indicating that Raikou, Entei and Suicune can be found roaming in the wild.

Trivia

 * The Legendary Beasts fleeing from the sanctuary was a reference to when the Beasts were revived by Ho-Oh in the Burned Tower, Johto after dying. After resurrection however, they all fled upon player's arrival.